Five-cornered buckwheat coal grate



Ap 1932- A. PISCIOTTA FIVE-CORNERED BUCKWHEAT COAL GRATE Filed Sept. 26,1929 2 Sheets-Sheet Ania n3 7 1156202240 0 d I F 44 h 0000 0 a N. 4 n3/8 2 3 3 M oooo .9 m V d A w Attorney April 2, 3 A. PISCIOTTAFIVE-CORNEREP BUCKWHEAT COAL GRATE Filed Sept. 26, 1929 2 Sheets-Sheet 2mumnmw nib my 733mb Zia,

A ttor ney Patented Apr. 12, 1932 PATENT OFFICE ANTONY rIseIo'r'rA,OFYELIVIHURST, NEW YORK FIVE-GORNERED BUCKWHEAT COAL GRATE Applicationfiled September 26, 1929. Serial No. 395,332.

This invention relates to furnace grates and is particularly adaptableto burning buckwheat coal.

An object of the invention is to provide a grate, the configuration ofwhich provides substantially on line 55 of Figure 3.

five points or corners that materially aid in stirring up the fireduringthe raking operation.

Another object of the invention is to provide projections on the gratebars that rock during the raking operation for the purpose of breakingup clinkers and stirring the bed of coals.

Another object of the invention is to pro} vide a hollow column on eachgrate that provides interior drafts for the bed of coals and furthermoreto provide a grate that is self raking in operation and that suppliesplenty of air for burning buckwheat coal.

Further objects of the'invention are to provide, in a manner ashereinafterset forth, a grate of the character referred to, that isstrong, compact and durable, thoroughly reliable for its intendedpurpose, very simple in its method of assembly andcomparativelyinexpensive to manufacture and installfl With the foregoingand other objects in view, the invention consists of a novel construction, combination and arrangement of 39 parts as will behereinafter more specifically described and illustrated in theaccompanying drawings, wherein is disclosed an embodiment of theinvention, but it is to be understood that changes, variations andmodifications may be resorted to withoutdeparting from the spirit of theclaims hereto appended. v

In the drawings, wherein like reference characters denote correspondingparts throughout the several views:

Figure 1 is a fragmentary vertical section through a furnaceillustrating in end elevation, an application of the present inventiontherewith.

Figure 2 is a fragmentary vertical section in detail through the furnacesimilar to Figure 1, illustrating the rocking movement of the grate barsin accordance with the present invention.

Figure 3 is a fragmentary transverse section in detail through a furnacetaken substant-ially on line 33 of Figure 2.

Figure 4 is atop plan view ofene of the grate bars.

Figure 5 1s a vertical section in detail taken Figure 6 is a sectiontaken substantially on line 6-6 of Figure 4:. I V

Figure "l" is a section through one of the legs of the-grate takensubstantially on line 7-7 of Figure 5.

Considerable difficulty has been experienced in burning buckwheat coal,owing to the fact that the particles of coal arein the finelycomminut-ed state, and moreover becausethe dirt or shale and slatecontainedin the coal has the effect of producing clinkers in the bed ofcoal. On the other hand, because of the'fineness of the granulations ofthe buck wheat coal, there is very little space or interstices betweenthe particles of coal in the bed to permit passage of air therethrough,and when a bed of coals of any thickness is utilized, it'has beenfoun-dthat there are burnt out or dead spots occurring in the bed of coals*which affects the heating efliciency of the furnace. I

It is therefore within the contemplation of the present invention toprovide a grate structure that w1ll promote contlnuous burningthroughout the entire bed of coals, to provide internal draftfor the bedof coals, and moreover to provide projections on the grate that willstir and break up clinkers in the bed of coals during the rakingoperation of the rate.

* Referring to the drawings in detail, F indicates vertically extendingfurnace walls be tween which the grate of thefpresent invention isdisposed. A pair of oppositely disposed, alined, longitudinallyextending jour nal bars 89, are secured to the side walls of the furnacefor the purpose of supporting the grate in accordance with the presentinvention. The grate for the furnace consists of a plurality ofhorizontally disposed grate bars indicated generally at 10 that aremounted for oscillatory movement on trunnions 11, 12 at each end of eachgrate bar that are journalled on thebars 8, 9. v a

-.-lugs 26 that serve to break up clinkers in" 32 there is an openings83leading from the Depending from the same end, each rate baris providedwith a leg 13 that is journalled to a shaker bar 14, the outer end 15 ofwhich is connected to a shaker lever 16,

pivoted as at 17 to the outside of the furnace F.

Each of the grate bars 10 is formed with solid ends 18 havingupstanding-raking arms 19 formed integral therewith and projecting abovethe upper face of the grate bar. The

lower ends of the arms 19 mergew-ith thetrunnions 11, 12. Between thesolid end sections 18, there are a plurality of inverted,

U-shaped sections 20, the legs 21, 22 of which are curved.

Each section 20 is transversely spaced to provide pockets 23 between therespective sections for the purpose of permitting air to flow throughthe grate. The bight portion -24 of each section 20 is flat on its-upperface and rising along'the median line of said bight portion there is anintegral rib 25 that merges at its opposite ends with the'raking arms19; Projecting above the rib are a plurality of the bed of coals.

The interior grate sections 20 are interconnected along the ends of thelegs by solid sections 27 and the bight portions 24: of each section areinterconnected by the rib 25, so

as to form one continuous grate 10.- Along theinterconnecting piece 27at the bottom of the legs this piece is scored as at 28 to provide teeth29between the scorings for breaking clinkers; Where the curved legs 21,22 merge with the bight portion 24 as indicated at 30 and 31,th radiusof the curve is such that when thegrat'e' bars 10 are at rest,substantially heart shaped pockets are provided between adjacent gratebars.

Disposed above the sharp curvesBO, 31", and supported on the bightportion 24 of the section 20 is a hollow member 32 of conicalconstruction. The base of the hollow member 32 extends onthe oppositesides of the bight portion 24 of one section 20 into the pockets 23 forproviding internal draft through the bed of coals. The side walls of themember 32 are provided with staggered openings 33 to providecommunication with the interior of the member.

Itv is also to be understood that the grate bars are reversible end forend.

Atthe extreme top of the conicalmembers there is provided a heart shapedpocket 34 when the gratebars are at rest.

When the grate bars 10 are raked, at the end of the stroke, they assumethe position shown in Figure 2 of the drawings and from this position itwill be apparent that a crushing efiect is produced by the wallssurroundingthe pocket 34. v From the foregoing construction it will beseen that a grate bar has been provided that has five points or cornersthereon for stirring up the bedofcoalsand breaking clinkers, the fivepoints being, each end of the legs which provides two "points, two morepoints where the legs merge with the bight portion and the fifth isprovided by'thetransverse rib 25-with its projection 26.:

It is to be understood that by describingin detailherein, any particularform, structure, or arrangement,it is not intended to limit-theinvention beyond the terms of the several claims, or the requirements oftheprior art.

Having described my invention, what I claim is 1. A grate bar comprisinga plurality of I substantially inverted U-shaped sections interconnectedtogether and arranged in spaced relation, each of said U-shaped sectionshaving the legs thereof oppositely curved,

with the convex edges of the legs being; ar-' ranged'in opposedrelation, a hollowmember supported on saidgrate bar, said hollow mem.her being opened at oneend,-and the wall. of the hollow member being,perforated, and

each of said inverted,- U-shaped sections provided at the bight'port-ionthereof with a projection for stirring the coals during-shakingoperation.-

'2..A grate bar, means for rockably' su f porting-the same, said gratebar beingsu stantially of inverted U-shape in cross section,and'havingthe legs of theinverted' U oppositely curved, aprojectionextending up-l Y ing of such a radius as to provide atopposite sides-of the grate bar sharpened projections,

bight portion of the inverted U provide a series of substantially fiverelatively "spaced which together with-the free end of the leg portlonsand the projection rising from the points or projections extendingsubstantially laterally to the axisof the grate bar.

Intestimony whereof I affix my signature' ANTONY PISCIOTTA,

